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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b9b868e94fbe4b3ba6eaa080d6602907e4e379f47b63dbeee0329487c53edfd' 
  AND token = '3Z71//zQCoKvVVnKX4chkb7vTvkVNia4k2hx5m4M5R4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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