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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f04d5c449766ffe08c6521be895a3230a9bff69ab92f49b99676f5f5cb340e0' 
  AND token = 'FXJadoM5DvjsI9yNh4GS7GJn/wWYnwi9zerB9da9K2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00210

JSON explain

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