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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24ad9a6b2affbb0aa83da86005d30bc1559c9f401deea1d4096a48631bbb5de0' 
  AND token = '6u6zwckpRBvMhtZCq5+dcT6INaBPOK0Ckq7dFqzGulA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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