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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6919926c23457b1220b18ea078bf6ad3a2a9c451dbfc58183bd7eaed7e76d8d9' 
  AND token = 'M7CkfexgkGcutB+sITo33BHoiAFybXZsIlY/Y08b9Po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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