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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '824654c2e1061d728e1cf479c57d21fd71c355333bd5083d79f5f83843264f25' 
  AND token = 'gKzdeY7VG2VLiTbLEuW8kNvVFHM2Fjh9wa7ltGYfNiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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