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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd7fd4ed4ddc03b28462897ad88e9bbb3eec0855a4b48410a6053e113fc00e63' 
  AND token = 'tWIGZX/fgGynJPUaKh70MDQHBhIekGkZQ4GaVhYi14Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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