SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3332557ffd4b0d9bb0076c68da3d05728478cbb4ed690f32c18e2bb2f84ca3e0' 
  AND token = 'RjphKij+kdjpbsDv+qwp7rYFKfY9y+QoJNbXVRY+T9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00097

JSON explain

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