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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad5184ee2f83146b4ea34844be09498221d907cba1e8032f5a0634344923ee8e' 
  AND token = 'jKPe5lbI2rMc9+ka5MDFzPXeJlBB4SF9FQY+9OaAg+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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