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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a897766a8ed1a665882d30145a11aeec66d610a44c86a34beeae0aaa068b2be6' 
  AND token = 'ctoqitrKerJQsYxHDaWQIA8skW4hNO/iHspdB1ISZhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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