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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dafc62fb0533b69853c4467afb6e5cc1f7ce9537c1af5e6d8aa39207b40d9e7' 
  AND token = 'jZQZ/YBCDmSJlHXjqAuDbadUzu5D73ADV/7jib94qaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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