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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f628f78dd51710af2ac759f8660d014b09c62f7f64f126199ed0f212ad5047f' 
  AND token = 'erMEwYMr8TdCMazmHeJae3o4QmwLo7ZsRherP4E4d4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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