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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbba0426f040bc107981e31648ad78d463d7a7cb279e7e6a8f068b8819dae3e6' 
  AND token = 'eZmh6SpQ86f0PLWWDLvo7yC5Bhgz4nVRzJX/JAS4RvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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