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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6c5835df571ed21135dd893472a7f23f474fa32ba1087c5bce4a5674c8a1248' 
  AND token = 'BUKR3rnKfM2yCl2yx1K3yH12Ug//pHJ36hNMl5lhOEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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