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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e28cd97e03c84a73db58815690753a81fac4c4eb0059a6cfb0c51f135a9fc9a' 
  AND token = 'yxJGo0zcGO2AE3vmakxowPakIOD/jd2qQz08/JgWORw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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