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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b42c0f1590bf13c452df88dfb8e0a12f56739602cb4a561fa18e9b62dbc9eb15' 
  AND token = '75ATWSgiUWvNNzoK4xsIUHB3lhIuHKpxxPGhEszq554=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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