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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16c944307b4a6b5c4d097b7d92281580912bd43f1d131eb3fefae527e0d8e4a6' 
  AND token = 'iWubyvV7K0O/dmXKsIBE3DoflMYJUYkEmod2V/u9zfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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