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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c2aab3f498c427ba79fbfd0ed53bb3975f0dce58c216b4092156dbad2fd9077' 
  AND token = 'jOUGtxPExOcIs348vOXr0BhSJdAAevdsZ6MO5Ybo4yA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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