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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eec5544867b565c39efc30b28b0472759992dbc5bf4ef19cfa01552f7e342ad9' 
  AND token = '0FXYeYVGC3duNWRW/q1xK0d7wS4PtOeYTcEHGzK95Nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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