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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9d7b098251a24ae2ddd897dbf950d1a640b223dd913d1338df5a7ae9856a8e4' 
  AND token = 'OVpLp0P8rrM68IE8Fl6lwGs7F9tyo+wyk31ipqkYvwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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