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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8d85c46b312af49f11a7f2e5f8b41f057a8af984eecf125f6fc4a2578c4b28e' 
  AND token = 'MtvSe77ThRPN0kqT16a/SpEcoEPl5gmzd5xChPMzroQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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