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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f572bc083b7e3aa6cc0a9d381591c11131f6515ac5a8e70d63fce5e303bb6432' 
  AND token = '/ClG0RBMY7amp8Dv0CvtqYKotCkfwNXxbIxMB3gPu2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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