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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1461f97c59e235a9c8d9782337a21a63b7e19b818dad0c1db5849eac1038ef5c' 
  AND token = 'zFMBdm2t93NuLwEagfHGqzEBKrQrJZw8W3zda4BJi5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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