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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c08fbd0e36b121dc93f163c36ea094a421ce588c41900a7b4d0ea7ec17a3747a' 
  AND token = '6cfJvFFsFGcS48RJ15L3Oj0LBHYwiOuvpNBz/XuoGXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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