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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a42961895e1d90db94eb27fa01c2a1f88e87c77912c6d1203f9212253cd2e23' 
  AND token = 'ZmpyxBHQVESEDxMmdaJlEVtBw2mP8bb7VsVCg9RJmKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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