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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f5fea01111479bd322808ec123cc1556273679314d42603149ff07d0c0b3925' 
  AND token = '7dzSstpKxQoqk5q/lU6rXKeBVsEROTyMxia/3L5I+70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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