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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7153151647aa905af68ae46b228881be33a38cb02a3600e1b99b06dea65f5411' 
  AND token = '3da0fC60qX9eJK7AqKy7m/nHXnlells5NWcCylt1b1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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