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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '383c9a99579ba885fbdb07f79ad99187d1d90bb06d2ec74336c0617bea5e99eb' 
  AND token = 'EW8HOE4hnL+E+mFEBrdDAd2jla9FcoxoL/sptt937Ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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