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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '191fe81bb4e5320d152ef50b7d0f7acf9e7551df7bf6a7748eab23376faca64a' 
  AND token = 'MO5ttDDBL8bLKAian7vztvtEF75QJJgotQkjhRr+a6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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