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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9707c25304d27ee259b0afe768455e1cadafe3e3cff0b7023f24a3bb98c2575' 
  AND token = 'an4S0LC4FSzifaX/0DUnVOqQGV5ADVbd5douTeD4Io0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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