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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '014b96e32e13cc1b7cc29a97ccddaded7ce64d73fd67545bc7b2b2501a42e725' 
  AND token = 'zPOvWthA3iG1tSJUkcDTAVpkmV1CjSu+F21BArCGqRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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