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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1035b628df5fa564c614b507f3b66ca5a4c72c85487a33dde9cdaa8381a62b3' 
  AND token = 'L+7Exxl5ynTpI+S26F/k9kQBsQbYWHjK75co6BjbxfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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