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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3191f1a70610887d64afba8bb354e3d54db597a6558464bf448c55d92625c7bd' 
  AND token = 'nlGKE8WfsIrOgrpwT1ysc+eRdWj/KpBCmC3L6QQBd38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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