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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ae425d93dfb7dafa564fa60c4b521ae245e4296fb040bd2db3fb65b6b0e7d04' 
  AND token = '4FRsYt3MmvVyNYXRUJVaOr9El5yI4jSshwrYTWXFvC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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