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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41d589b2ae14b1f3eea1246f752c5be7d1528d3560a5771800968ca1c3df895e' 
  AND token = 'KM9Mhtb/7xDglKd7rfPd+NOc9N8nLIwmkNgFmZy/iww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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