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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9ba7dd041c07a473b88565d462b27be0ee4a7b8bb60b870a3575e506dad6cd6' 
  AND token = 'g2ovwKrRZuB4PDbOcseVTj67QZhjlkRKHqrjBOIGHbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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