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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30dd4950b3e9ffb33eae45653726e64cc28ae342f5b6d93055f3ed12feead3c2' 
  AND token = 'PE/93Z7w8KN+Dx1zlAg8hNJExD4TdCS5QnjEDPSjM3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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