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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3240cac0020d66d013613f130a6c218d57968335ce8dc1a2b6365389d8a87221' 
  AND token = 'zu88d/mDnHywdmkLTtuL9z+IsKUPhRC253s4eSSGJ8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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