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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12dfb6a51a68b3ebdf989d9d4a82b41c0ccf30ad5a107c5c7f037d4b6c4f68d6' 
  AND token = 'bi2wsz8O3cqOUAK0Tz7VoixzMeFAkwPep7Z3XUidjQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}