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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec9a830cc52fd72dd89ca228adb72b5bbc683b2eab3ee2de07a018462ccc74fb' 
  AND token = '1EwoJGEGQq2wCwuVpaxws0KJ6SazYGX0xziKvtElhdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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