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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dab16fc2eab8c47271b593e5f2d13f2794b12c4129f433844487f329a8dfcec' 
  AND token = '4xqSRLHMu2q3Y+mVu2dUmfkGHTNUidL32h/yJnVzYa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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