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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c915afed5648a9eff67ed514abaddab633d8b873e3788b42c01523a9f4b69881' 
  AND token = 'rbnJSp4ofo9L3sjfwnsH2w+9tM8ANYm8iTjYGdmt5DU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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