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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce65aa36deffa0a6ccddd5e626a055aef52b92fa48c58bf07a1cd1a61e5b4ee3' 
  AND token = 'nBOzDXy/OYTsCedr7IeOH7BEupraeo83vb9ZQeK0vJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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