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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8792f1d7b8e6522ddf5b75545504ea06d7d04501f1c3500ace498616c9a7f8a3' 
  AND token = 'NyDAuuNilIXrt7n+B2/drUFP8S4ZIfTlqfcn3qBpG64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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