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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c5bc17f69defc993adefb0af52c674213be673aeb43a4075ec59237b75fd9e1' 
  AND token = '1k/J0hmRxv95j4Q1hK5n3yyQCOK+ftM680+toBcrq18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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