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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '534ae28d931dbb453f5be8d601128d9705e79d22998cc8a5834aa893b7e394bd' 
  AND token = 'CF/5xcF51FNuJfeldfMlwc0FOrFI8CLt/7vD6p9lzgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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