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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cde7803f6681be4b3100d82a2bd1d222081d0e34f4f75bae57902714a3b50fd9' 
  AND token = '6XBoaJ/wtnSrl+wC1R4ngndCCLFQ6FwrJ1raRxVpKNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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