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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc3da9376b12c30b86c849d1ee44af86d6563ced418fa52acd52c51465350a1a' 
  AND token = '1L7dMkpA1r+f5NerE+obUf00fwjaufU/REMTOCjq9lE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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