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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c1a98e423ea592de29655b3ea44f50e10811a17e5fe4cae977c3f88e60e472d' 
  AND token = 'lXlqHxa9WznooGqF7N6DELEH5re7Vd3DIuf3PLnL6Kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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