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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc6b04758edd496bf5a7873e9fd1d7ef55351d9c94fcd46abf3c44e10b27d3f5' 
  AND token = 'Uji4vY2enbphrdd6f31L/GSnEu5zzbcf4jFy1evRY/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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