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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c089673d8072ab0adfe7862619b2695b9492b2208a7399a57d30afcf7e66d457' 
  AND token = '04yysHnLiLgH8Zo5Cw2sXHmQBlbfp0i7tzdaT05bDm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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