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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9e46127bc7dde76609a9fff5f36a87b9eb3804a1740593efe018058ebc1ec8d' 
  AND token = 'ZQw0Mh8B9qteJ7Gi7tzih3vbOdy5S322UagBE5GCPko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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