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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '270f9be9c44f0da325ea7c1a97efb3fc71ab6d8ffff59ad1e0a63f67b447513e' 
  AND token = 'WhrhraueRmJ/ys4Xlgooe+/x0BLxKSKVIQLCyl9iKbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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