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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab418bb0ee437e18e4a444934cd66222d793ae7214516f9239daad100c476cc2' 
  AND token = '55JlUBkdsboVvNzehl/CmE0sAZp1O/ERgnubRH+5c1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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