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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae88619f3750713c33d844c6de1d1079a776e82a863c664d2a266f0d09ed0263' 
  AND token = 'qN9VraUdTiNH3ag7Hu86DNmCJe5LCp2QSiENnTSOTCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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