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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6224605fee9f28a089ef1e04b3e1838f21ed46cc8e2e55b215bc4c8131bdbf2' 
  AND token = 'vCMscJgxo9g45U8qW1J6MC0CQkHnAcop5q4l9OdMhOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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