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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d70cf09dbbdab804a62c8ebfe679f1c62847d12b10f5652ca69f05d8a5cb821' 
  AND token = 'jX6KLI8DLWyAbZ0GzVn1whzvvP2I0ERI7IiE3fnMukE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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