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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '921396d0d4044441457c5d1565fc959ee15f2e50c2e5a4bbf8668ebf5b5705fa' 
  AND token = 'k629IX62D3pvuBRI/JRt+yh2Ei/p+sYUSVTmeL7Pzcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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