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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7db7e594c2ae66ab732905a794bc87e4be0cfd2741b786b428410b8a12868ae' 
  AND token = 'M68OOPmxbXJwCRw924Xwa0Ya1KR1jwV1nExyJ6KjCrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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