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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2ff771c6a4a9a8481f877609e762ca80d91f6b2019cfdc0382f01831c565030' 
  AND token = 'EcEUwtVGghat0Rz1XoAf0YQ1kLDb2kbRVCbal9ocbTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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