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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a3ba6f46f3c8ffab7da50171de9235cf3036c61d9db46aaac83862ae42fe968' 
  AND token = '0T7ulIFHnTa7cLD/vvZ7lo8A6ZJaD0li5L7PWBcQ3hU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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