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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1d7b3fcb9326c3a61a71faf0645e880122fac05310e0fe6aebbe906b5208c69' 
  AND token = 'c5IM9SoTV5PddlPvH4A52roIFNlidPYGavQ7fSJyDAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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