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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db0eb7c6462b221c7837385eca1c91199f0cd54fa77f06e2e52b06fb65277d18' 
  AND token = 'NgKtcipmYi0WLwTn0DH2GiJP5bbsGj7ph8SNpw+6COA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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