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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9ab00b45b4128de58875daac99f9063e3ce9f49131ccfde4acbfb5484d618bd' 
  AND token = 'aFlPPk3OXkAH/YsWDvqWNZXFh5UGRjchgdgVeM7ny9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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