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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '397b9e5415fd6e4eb10a9bcfe0c516ea40d85259f661dd098cad7f2df2df3f3b' 
  AND token = 'JcyopCMFy383h45B4iuCOLWRbbqTpMZz6bg5vYgB36w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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