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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0bf01586f84234a93d764bbf9c1ce74967e2b3ff47c6b82dcb4c5cc6db208a5' 
  AND token = 'vmgvnoiMEuc8QuAF0umlJA8qn3Y/hey1WApWQK3bSTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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