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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4012c128023753b747c0074cbd2c4ad0da0ca2ae161bdf7b66b02f7d5154ee8e' 
  AND token = '85h+gp2D2nzDlUyk18FXD/aVPZp3piVy9aU0WjBy4mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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