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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8447f531968dc30199f3cec3753040cdb9f6eb241439455c837ae7a21f415b80' 
  AND token = 'bpmvTtWgCN4gdk5CA+4+VJ6K/0r5lOK05q7kCs1WHgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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