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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dd1393072c1fe260145925f5ef658429dfae76d7f1b767a7e69ce2029cb2eff' 
  AND token = 'ak3pzihqox19KqhdcGr8uRc9QSVkJFT5ugn88QM07cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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