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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef9821d19f2d366abfc3bbc4a1e3b5b8525cbc17fbefc8f5e386bb8a989326fb' 
  AND token = 'tlS8YFe2+lEEE9/eceHE8BrNSJYXcM9pnylivh1Am4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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