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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89720f3a76c030408c83e19450760ad6c6f866dab0d785b5af29299103bfd590' 
  AND token = 'AdRZFi1mpep1UEQpn2qFzxKnpECS/rg6L2yVcQY9sm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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